By north you mean up, I assume.
And while that doesn't mean they can't install a camera, it does mean it would be the worst possible orientation. It would have to be a big ball on top or an assembly that came down underneath the lamp to point the camera at the ground.
You could also plug in a non-camera sensor, like a Stingray cell phone snooper. Those are omnidirectional.
But the bottom line is "you can plug stuff into power outlets", which is not really a story.